Merge pull request #38 from shinji-san/dependabot/nuget/develop/xunit-2.7.0

Bump xunit from 2.6.1 to 2.7.0

Resolves_ #38

Author: shinji-san

tests/LuhnDotNetTest.csproj

@@ -9,7 +9,7 @@
 
     <ItemGroup>
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
-        <PackageReference Include="xunit" Version="2.6.1" />
+        <PackageReference Include="xunit" Version="2.7.0" />
         <PackageReference Include="xunit.runner.visualstudio" Version="2.5.3">
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
             <PrivateAssets>all</PrivateAssets>